My OTP is Amuto, but that is very irrelevant in my opinion because it's a pretty unhealthy ship as far as I'm concerned.

The top ship I'd pick would be Rima/Nagihiko. Nagihiko, while masquerading as Nadeshiko, was always emotionally supportive of Rima. He continued to listen to and support her even after she found out his secret. He's also physically protected her, and allowed her to do the same. These two characters are not manipulative of one another and allow each other plenty of freedoms while remaining close with each other. Rima brings out the best in Nagi, and Nagi brings out the best in Rima. They compliment each other so well, that I believe their ship is the best.